Mac Mouse Lag ingame.

Hello, I have a problem with my mouse after upgrading my Mac Yoesmite Lion to MacOSsierra. The problme is that when I join a game, my mouse begins to lag, and I don't know the reason why. I have tried everything from removing acceleration from my mouse, to downloading apps which may help. None have seemed to work. Btw, I am using a Magic Mouse 1. Thank you for your time, and please let me know on what I can do to fix this situation.